Emet-Selch is a transforming card, meaning he has two sets of abilities that can be used, though once he's been transformed he can't go back
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Seeing it on a real, playable-in-eternal-formats Magic card is a big step
She's a two-mana Commander that can be used the turn she arrives, and with some Wizardly backing, she'll get some big-mana bombshell instants and sorceries on the table faster than your opponents can blink
Four mana for a counterspell is a lot, but if you can work it in on an early turn, it allows you to build your board while holding up more answers, which is a point these decks love to get to
Two types of players pilot The Beamtown Bullies: those that want to play some chaotic group hug strategy, and those who want to gift their opponents self-destructive cards like Leveler and Eater of Days